A solution that contains 55.0 g of ascorbic acid (Vitamin C) in 250. g of water freezes at –2.34°C. Calculate the molar mass (in units of g/mol) of the solute. K f of water is 1.86°C/m

Explanation:

Hello,

In this case, we consider the depression in the freezing point as:

Whereas the van't hoff factor for ascorbic acid is 1 since it is covalent, thus, we solve for the molality as shown below:

Next, since molal units are mol/kg, we can compute the present moles of ascorbic acid in the 250 g (0.25kg) of water:

Finally, the molar mass with the given 55.0 g of ascorbic acid:

Regards.

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